Initial efforts towards optimizing AoI mostly involved the analysis of various queueing models; e.g., [1]} for analysing a single source single server queueing system with FCFS service discipline, [2]} for LCFS service discipline for M/M/1 queue, [3]} and [4]} for multi-source single sink system with M/M/1 queueing at each source, [5]} for AoI performance analysis for multi-source single-sink infinite-buffer queueing system where unserved packets are substituted by available newer ones, etc.
